Numerical Analysis of the DQPSK Modulation Formats Implementation With 40 Gbits/s
This paper treats the performances of an optical
telecommunication system functioning with the 40 Gbit/s flow
by a numerical analysis of the physical effects limiting the light
guided propagation. The format studied here is a DQPSK
modulation format (Differential Quaternary Keying Phase-Shift).
It allows a transmission of information on four different levels of
phase of the optical signals. Taking into account the complexity
of the communication optical systems and joint action of many
propagation physical effects (linear or non-linear), the
optimization of the systems functioning with DQPSK modulation
formats must be apprehended beforehand by digital simulations
to direct the choices of the future designs. It is a study on a
transmission with a single channel on only one optical fiber
section. In particular, an analysis must be led concerning the
impact on the transmission quality of the non-linear Kerr effects
combined with the chromatic dispersion inherent of the
propagation on optical fiber. The most effective technique to
thwart the harmful impact of these effects is the management of
chromatic dispersion. The obtained results will be presented and
discussed.
Keywords: Optical fiber, optical transmission systems, 40 Gbit/s
flow, in phase modulation formats, OCEAN, numerical
communications
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